Press for making plaster-board.



W. P. KELLY. PRSS FOR MAKINGPLASTBR BOARD.4

APPLICATION EILBL ARR. 28, 1910.

Patented Aug. 23, 1910.

3 SHEETS-SHEET 1l.

W. P. KELLY. `'PRESS FOR MAKING PLASTER EGARD.

APPLICATION PILPD APR. 2s, 1910. "P- t t d A 23. 1910 967,933. a en'e ug' s SHEETS-SHEET 2.

W. P. KELLY. PRESS FOR MAKING PLASTBR BOARD.

3 SHEETS- SHEET 3.

` plaster board is being another plaster beard which has already are screwed Ainto the pressure, plate Fand WILLIAM F. KELLY, OF ST. LOUIS, MISSOURI.

PRESS FOR MAKING PLASTER-BOABD.

Speccation of Letters Patent.

Patented Aug. 23, 1910.

Application filed April 28, 1910. Serial No. 558,248.

To all wlcfm'ct may concern:

Be it known that I, ViLLiAM F. KEpLY, a citizen of the United States, residing 1n the 'city of St. Louis and the State of Missouri,

asbestos and other incredients which enter I into the composition ot the plaster board are subjected to heavy pressure.

In making plaster board the ingredients are mixed and then spre 1d in a layer in a frame or mold and are subjected to pressure by which the materials forming the plaster board are pressed into a compact dense sheet or board, and then the plaster board is removed froin the 'trame and allowed to harden or set.

The object of my invention is to provide a press whereby the pressure to which the plaster board is subjected may be varied; and a further object of my invention is -to provide a press which may be easily operated and in which the plaster board may be retained under pressure o' a fixed amount; and a still further object ot my invention.

is to provide a press in which while one subjected to pressure been pressed is by the action of the machine being lifted out et' the trarne .in which it was foi-ined.

My invention is fully shown in the accompanying drawings where similar letters are used to` designate similar par Figure l is a side View of the press; Fig. 2 is a front View with a part of the base of the press cut away so as to show the internal mechanism; and Fig. is a plan view looking down on top or" the press.

Referring to the hgures, A is a base or table having a smooth top si rface and carrying upwardly projecting columns B which support girder portion D is a shaft supported bearings E carried by the bracket two the columns B. F the pressure plate is provided with guides Awhich more alone the columns B.

G represents guide bolts chose lower ends which project upwardly through openings in the spring plate G and Which are provided with nuts on their upper ends.

H represents heavy coil springs encircling the bolts Gr between the pressure plate F and the spring plate G.

J and K are levers which form a toggle which is connected to the spring plate G and the girder C, respectively, by the pins g and c.

h is the knuckle pin of the toggle formed by the levers J and K, and to it is fastened the eccentric arm L which is operated b the eccentric M attached to the shaft D.. en the shaft D is made to turn the eccentric M moves the eccentric arm L toward the left of the position shown in Fig. 1 so as to straighten the toggle and thus depress the spring plate G and With it the ressure plate F. It the pressure plate is depressed as far as it can be it will come to rest and thenv a further straightenin of the toggle will depress the spring p ate `Gv against the resistance of the springs H, and as long as these springs remain active so that they are subject to further compression no greater pressure can be brought upon the material beneath the pressure plate F than that required to compress the springs H. By adjusting the strength of the springs I-I it is evident that the amount of pressure to which material beneath the pressure'plate F is subjected may be regulated.

I represents stop bolts 'by which the amount of compression of the springs H may, when necessary, be limited. When the springs II are compressed so that the lower ends of the bolts I come in contact with the pressure plate F,.astraightening of the toggle tends to move the sprmg plate G and the pressure plate F downward as though they were made integral.

N N, and N are frames in which the` plaster boards are Iformed. N', shown dotted in Fig. 3, represents a frame in osition to be filled with material of which t e plaster boards are formed; N represents 'a frame in position under the pressure plate F; and N shown in Figs. 2 and 3,represents a frame ,in which isla plaster board that has been subjected to pressure .and which is about to be removed from the frame.

a are guides which hold the frame N in place. 1

b and d are stop guides for the frame N.

b are clamps operated bygthe handle c by which the frame N is heldin place against the stops b and d.

The size of a plaster board is determined by the inside dimensions of the frames, and the lower or under part of the pressure plate vF projects downward and is slightly smaller than the inside of the frame N, so that when the material composing the plaster board is being subjected to pressure the lower or under partof the pressure plate F enters the frame N.

P is an angle piece attached to the rear guides j' of the pressure plate F. When the pressure plate F is depressed the angle piece P comes in contact with the roller Q carried at the end of the arm R. The arm R is attached to the rocker-shaft S, which carries rocker arms R provided with rollers T. The rollers T support a plate U which has attached to it and projecting outwardly therefrom plungers V.\ These plungers pass upwardly throuo'h ,openings in the upper part of the table or base A of the press, and their pur ose is,"as shown in' Fig. 2, to lift the plasterioard that has been subjected to pressure out of the frame N.

' When the pressure plate FV is depressed the Y. in the hub or boss of the pulley O.

angle ieee P comes in contact with the roller (5 and depresses the outer end of the arm R so asto make the shaft S revolve through a limited angle and thus raise the rollers T at the end of the arms R', asindicated by the dotted lines in Fig. 2, and thus raise the plungers V and lift the plaster board from the frame N.

It is preferable to put the material of which the plaster boards are formed between metal sheets or plates in the frames in which the boards are pressed, as' indicated in Figs. 2 and 3, where m represents the lower inetal plate, l the plaster board, and g the top or cover metal plate. c.,

The press is driven by nwans of a belt passing over a pulley O loosely mounted on the shaft D, but which can be made to drive the shaft D by means of a clutch attached to and carried by said shaft. The clutch consists of a part y) rigidly mounted on the shaft D which carries a pin fr having a shank adapted to engage with an opening t The shank .of the pin 71 is provided with a coil spring s -which ordinarily `prevents the s ank fromv engaging with the opening t. The head of the pin r presses against a collar n loosely mounted on the shaft D. The face of the collar adjacent to the pin r is at right angles to the shaft D and the opposite face is beveled as shown in Fig. 2. The collar n and the part p of the clutch revolve in a casing e which is supported by oneof the bearings E. l Projecting upwardly through the lower part l of the casing z is a,

pin f] whose upper endv is beveled to the same angle as the beveled face of the collar` n. When this pin is raised its beveled end engages with the beveled face of the collar n and forces the collar to the right of the position shown in Fig. 2 and makes it press the pin fr' outwardly toward the pulley O so that the shank of the pin r engages with the opening t, and then the shaft D is made to revolve with the pulley O. The pin g projects upwardly through the casing e from the member and is kept' normally vfrom engaging with the collar n by means of the spring w. The member m is raised by means of the rod y when it is desired that the elutcl1 sl1all operate to make the pulley O drive the shaft D.

When it is desired to make a plaster board, a frame is placed on the table A in the position of the frame N shown in Fig. 3, and the lower metal plate m is placed in the frame, then the materials which enter into the plaster board are spread over the metal plate m to a uniform depth and the top or cover plate g is placed in the frame on top of the material of the plaster board. T he frame is then moved into the position of the frame N in Fig. 3 and the clutch is operated so as to make the pulley O drive the shaft D, and through the medium of the arm L and the toggle composcd'of levers J and K the pressure plate F is depressed so that its lower or under part enters the frame N and presses or squeczes the material therein into a hard compact plaster board. -When the toggle has been nearly straightened the clutch may be operated so that the pulley will no longer drive the shaft and the plaster board may be allowed to remain for some time under pressure in the frame N, or if the pulley is driven slowly the machine need not be stopped but the plaster' board in the frarnefN may be subjected to .pressure only during the time that the pressure plate is depressed for one revolution of the shaft D. The pressure to which the plaster board will be subjectedwill depend largely upon the strength of the spring H between the pressure plate F and the spring plate G. When the plaster board has been subjected to pressure the frame is moved to the position of the frame N'l of Fig. 3 and clamped by means of the clamps b in place against the stops b and al. When this is done, at the next downward stroke of the pressure plate F the angle piece P will come in contact with the roller Q, which will operate the arm R sq as to makethe shaft S revolve througha limited angle and raise the arms R witlthe rollers T and thus raise the frame U and the plungers V to lift the plaster board upward out of and beyond the frame N as shown in Fig. 2. When the l plaster board and thepmetal plates g and m It is evident that by making the table A of the press large enough to receive three plaster board frames as shown in Fig. 3 one frame will be in the position of N Where the material is being put in the frame, and the second frame will be in the position ofthe frame N where the material is either subjected to pressure or ready to be subjected to pressure, While a third frame will be in the position of N ready to have the pressed plaster board lifted out of the frame into a position from which it can be readily removed from the press.

It is evident that the sizes ot the framesv and strength and dimensions of the various parts of the press must be made to snit the needs of the conditions and sizes of the plaster boards to be made.

What I claim as new and desire to secure by Letters Patent, is:

i. A press for plaster boards comprising a table, a pressure piate adapted to move toward and from said table, a spring plate carried by said pressure plate and adapted to have a limited motion toward and from said pressure plate, compression springs between said pressure plate and said spring plate, means whereby said spring plate is moved to make said pressure plate move toward and from said table, and means operated by said pressure plate as it moves toward said table whereby a plaster board that has been subjected to pressure is lifted from said table, substantially as described.

2. A press for plaster boards comprising a table, a pressure plate adapted to move toward and from said table, guide bolts carried by said pressure plate, a spring plate adapted to have a'limited motion along said guide bolts toward and from said pressure plate, compression springs between said pressure plate and said 'spring plate, a toggle whereby said sprin plate 1s moved to make said pressure p ate move toward and from'said table, means whereby said toggle is operated, and means'operated by said pressure plate as it moves toward said table whereby a plaster board that has been subjected to pressure is lifted from said table,rsubstantiall`y as d`e' scribed,

3. A press for plaster boards comprising a table,ia pressure plate adapted to move toward and from said table, a spring plate carrled by said pressure plate and adapted to. have a llmited motion toward and from sald i pressure plate, compression springs between said pressure plate and said spring plate, means whereby said spring;r plate is moved t0 make said pressure plate move toward and ,from said table, plungers adapted to .lift e0 from said table a plaster board that has been t subjected to pressure, and means whereby said plungers are operated by said pressure plate when said pressure plate is made to move toward said table. substantially as described.

4. A press for plaster boards comprising atable, a pressure plate afglapted to move toward and trom said table, guide belts can ried by ysaid pre sure plate, a spring L- "5s adapted to have a limited motion guide bolts toward and from vsaid plate, compression springs en rassure plate and said spring plate, bolt-s whereby the motion of' the sprin -f t toward the pressure plate may be i i a toggie whereby said spring plate to make said pressure plate move lo, and from said table, means Where toggle is operated, and means opera said pressure plate as it moves toward ir table whereby a plaster board that has subjected to pressure is lit table, substantially as describes.

a table. havin f openinvs in the to thereof for piangere, pressure plate adapt zd to move toward from said ,le to om side or' said openings, meses wh ysa-iid. pres sure plate is made to move, p angers snapt ed to move up through said openings in saidV table and project aiove the top thereof, a. frame supporting said piangere from belt-W, and means operated by said pressure plate as it moves toward said table wherebv said Tll'iLilv/l F. KELLY.

Witnesses:

P. O. BCHER, FRANK BUCHER. 

